WO2013115363A1 - Laiton présentant une excellente résistance à la corrosion - Google Patents

Laiton présentant une excellente résistance à la corrosion Download PDF

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Publication number
WO2013115363A1
WO2013115363A1 PCT/JP2013/052354 JP2013052354W WO2013115363A1 WO 2013115363 A1 WO2013115363 A1 WO 2013115363A1 JP 2013052354 W JP2013052354 W JP 2013052354W WO 2013115363 A1 WO2013115363 A1 WO 2013115363A1
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mass
less
amount
zinc content
relationship
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PCT/JP2013/052354
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English (en)
Japanese (ja)
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亨 内田
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Toto株式会社
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Application filed by Toto株式会社 filed Critical Toto株式会社
Priority to EP13742899.1A priority Critical patent/EP2743360B2/fr
Priority to CN201380004072.7A priority patent/CN103958708B/zh
Priority to US14/346,620 priority patent/US10351933B2/en
Publication of WO2013115363A1 publication Critical patent/WO2013115363A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C9/00—Alloys based on copper
    • C22C9/04—Alloys based on copper with zinc as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/02—Making non-ferrous alloys by melting
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/02—Making non-ferrous alloys by melting
    • C22C1/03—Making non-ferrous alloys by melting using master alloys

Definitions

  • the present invention relates to a highly corrosion-resistant brass, and more particularly to a highly corrosion-resistant brass that does not require a heat treatment step for suppressing dezincification corrosion.
  • Brass which is a copper-zinc alloy
  • Brass is a copper alloy used in various applications because of its excellent workability, strength, and corrosion resistance.
  • zinc which is a constituent element of the alloy, may elute preferentially over copper and other components, and dezincification corrosion may occur. The higher the zinc content, the more likely it is to occur. is there.
  • brass having copper / zinc of about 60/40 has a two-phase structure of an ⁇ phase and a zinc-rich ⁇ phase, and selective dezincification corrosion occurs in the ⁇ phase.
  • the heat treatment performed to obtain dezincing-resistant brass is a complicated heat treatment step, and the cost is higher than that of general brass.
  • heat treatment must be performed after the processing, and productivity is greatly reduced.
  • JP 2011-179121 A (Example 12) JP 2011-219857 A (Example) JP-A-2002-349574 (Example 16) JP 2010-133006 A (Examples 3, 5, 7, 8, 13) JP 2010-242184 A (Examples 10, 13-39, 42-51)
  • the present inventors have realized a highly corrosion-resistant brass in which dezincification corrosion is suppressed without being subjected to a heat treatment step by defining Sn and Al and the apparent zinc content at a specific ratio. I learned that I can do it. Furthermore, it was found that brass with good characteristics, particularly brass with good castability, can be realized by adding a small amount of Si. The present invention is based on these findings.
  • the object of the present invention is to provide a highly corrosion-resistant brass that does not require a heat treatment step for suppressing dezincification corrosion.
  • the brass according to the present invention is Cu: 55 mass% or more and 75 mass% or less, Si: 0.01% by mass or more and 1.5% by mass or less, Sn and Al: amounts satisfying the following relationship, Mn as an optional component: less than 0.25% by mass, Ti as an optional component: less than 0.05% by mass, Mg as an optional component: less than 0.3% by mass, P as an optional component: less than 0.15% by mass, Rare earth metal as an optional component: less than 0.004% by mass, It consists of Zn as the balance and inevitable impurities, Brass with an apparent zinc content of 37 to 45, (I) When Si is 0.01 mass% or more and 0.1 mass% or less, (1) When the apparent zinc content is 37 or more and less than 39, and Sn and Al are x mass% and y mass%, respectively, (1-1) 0.1 ⁇ x ⁇ 0.2 and 0.1 ⁇ y ⁇ 2.0, or (1-2) 0.2 ⁇ x ⁇ 3.0 and 0.1 ⁇ y ⁇ 2.
  • Sn (x mass%) and Al (y mass%) are (2-1) 0.1 ⁇ x ⁇ 0.2 and ⁇ 4x + 0.9 ⁇ y ⁇ 2.0, or (2-2) 0.2 ⁇ x ⁇ 3.0 and 0.1 ⁇ y ⁇ 2.0 Is an amount that satisfies the relationship (3)
  • Sn (x mass%) and Al (y mass%) are (3-1) 0.1 ⁇ x ⁇ 0.2 and 0.5 ⁇ y ⁇ 2.0, (3-2) 0.2 ⁇ x ⁇ 0.3 and ⁇ 4x + 1.3 ⁇ y ⁇ 2.0, or (3-3) 0.3 ⁇ x ⁇ 3.0 and 0.1 ⁇ y ⁇ 2.0 Or (II) when Si exceeds 0.1% by mass and is 0.5% by mass or less, (4)
  • Sn (x mass%) and Al (y mass mass%) are (2-1) 0.1 ⁇ x ⁇ 0.2 and ⁇ 4x + 0.9 ⁇ y ⁇ 2.0, or (2-2) 0.2 ⁇ x ⁇ 3.0 and 0.1 ⁇ y ⁇ 2.0
  • Sn (x mass%) and Al (y mass%) are (7-1) 0.3 ⁇ x ⁇ 0.4 and ⁇ 5x + 2.5 ⁇ y ⁇ 2.0, (7-2) 0.4 ⁇ x ⁇ 0.5 and ⁇ 4x + 2.1 ⁇ y ⁇ 2.0, or (7-3) 0.5 ⁇ x ⁇ 3.0 and 0.1 ⁇ y ⁇ 2.0 Or (III) when Si exceeds 0.5% by mass and is 1.0% by mass or less, (8)
  • Sn (x mass%) and Al (y mass%) are (8-1) 0.1 ⁇ x ⁇ 0.2 and ⁇ 4x + 0.9 ⁇ y ⁇ 2.0, or (8-2) 0.2 ⁇ x ⁇ 3.0 and 0.1 ⁇ y ⁇ 2.0 Is an amount that satisfies the relationship (9)
  • Sn (x mass%) and Al (y mass%) are (8-1) 0.1 ⁇ x ⁇ 0.2 and ⁇ 4x + 0.9 ⁇ y ⁇ 2.0, or (8-2) 0.2 ⁇ x ⁇ 3.0 and 0.1 ⁇ y
  • Sn (x mass%) and Al (y mass%) are (10-1) 0.2 ⁇ x ⁇ 0.3 and ⁇ 5x + 2.5 ⁇ y ⁇ 2.0, (10-2) 0.3 ⁇ x ⁇ 0.4 and ⁇ 4x + 1.7 ⁇ y ⁇ 2.0, or (10-3) 0.4 ⁇ x ⁇ 3.0 and 0.1 ⁇ y ⁇ 2.0 Is an amount that satisfies the relationship (11)
  • Sn (x mass%) and Al (y mass%) are (11-1) 0.3 ⁇ x ⁇ 0.4 and ⁇ 5x + 3.0 ⁇ y ⁇ 2.0, or (11-2) 0.4 ⁇ x ⁇ 3.0 and 0.1 ⁇ y ⁇ 2.0
  • Sn (x mass%) and Al (y mass%) are (13-1) 0.1 ⁇ x ⁇ 0.2 and ⁇ 5x + 2.0 ⁇ y ⁇ 2.0, (13-2) 0.2 ⁇ x ⁇ 0.3 and 1.0 ⁇ y ⁇ 2.0, or (13-3) 0.3 ⁇ x ⁇ 3.0 and 0.1 ⁇ y ⁇ 2.
  • Sn (x mass%) and Al (y mass%) are (14-1) 0.4 ⁇ x ⁇ 0.5 and ⁇ 5x + 3.0 ⁇ y ⁇ 2.0, or (14-2) 0.5 ⁇ x ⁇ 3.0 and 0.1 ⁇ y ⁇ 2.0 Is an amount that satisfies the relationship (15)
  • Sn (x mass%) and Al (y mass%) are (15-1) 0.2 ⁇ x ⁇ 0.3 and ⁇ 5x + 2.5 ⁇ y ⁇ 2.0, (15-2) 0.3 ⁇ x ⁇ 0.4 and ⁇ 4x + 1.7 ⁇ y ⁇ 2.0, or (15-3) 0.4 ⁇ x ⁇ 3.0 and 0.1 ⁇ y ⁇ 2.0 The amount satisfies the above relationship.
  • highly corrosion-resistant brass can be provided without undergoing a heat treatment step that greatly affects the cost and productivity of dezincing brass. Moreover, the castable highly corrosion-resistant brass material which does not require a heat treatment process has been realized.
  • Apparent zinc content means an amount calculated by the following formula proposed by Guillet. This formula is based on the idea that additive elements other than Zn show the same tendency as Zn addition.
  • Apparent zinc content (%) [(B + tq) / (A + B + tq)] ⁇ 100
  • A Cu mass%
  • B Zn mass%
  • t means the zinc equivalent of the additive element
  • q means mass% of the additive element addition amount.
  • the zinc equivalent of Bi is not yet clearly defined, but in this specification, it is calculated as 0.6 in consideration of the literature. Further, other elements are added in a very small amount, and the influence on the apparent zinc content value is small, so “1” is set.
  • “inevitable impurities” means an element having an amount of less than 0.1 wt% unless otherwise specified.
  • Mn, Ti, Mg, P, rare earth metals, and the like are included in the inevitable impurities, the addition of an amount separately determined in this specification is allowed.
  • the amount of this inevitable impurity is preferably less than 0.05 wt%.
  • the brass according to the present invention is a high corrosion resistance brass that is obtained without undergoing a heat treatment and in which dezincification corrosion is suppressed.
  • the reason why high corrosion-resistant brass with suppressed dezincification corrosion can be realized without heat treatment is not clear, but is considered as follows.
  • Sn, Al, and the apparent zinc content are controlled within a range described later. In such a composition ratio, Sn and Al are considered to act so as to dissolve more in the ⁇ phase than in the ⁇ phase and to effectively suppress the elution of zinc in the ⁇ phase. As a result, dezincification corrosion is suppressed.
  • Sn is particularly excellent in the corrosion resistance improving effect, but when the amount added is increased, there is a tendency that a new Sn-rich ⁇ phase is generated (Sn in the ⁇ phase shifts to the ⁇ phase).
  • the present inventors have found that Al has an action of suppressing the precipitation of the ⁇ phase. Therefore, it is considered that the addition of Al not only enhances the corrosion resistance of the ⁇ phase, but also enhances the effect of improving the corrosion resistance of Sn.
  • the brass according to the present invention comprises the first to fifteenth aspects, and is divided into the following four groups (I) to (IV), and each group can be further divided into several subgroups. Specifically, it is as follows.
  • 1st aspect Group (I), subgroup (1) Cu: 55 mass% or more and 75 mass% or less, Si: 0.01% by mass or more and 0.1% by mass or less, Sn and Al: amounts satisfying the following relationship, Mn as an optional component: less than 0.25% by mass, Ti as an optional component: less than 0.05% by mass, Mg as an optional component: less than 0.3% by mass, P as an optional component: less than 0.15% by mass, Rare earth metal as an optional component: less than 0.004% by mass, It consists of Zn as the balance and inevitable impurities, (1) When the apparent zinc content is 37 or more and less than 39, and Sn and Al are x mass% and y mass%, respectively, (1-1) 0.1 ⁇ x ⁇ 0.2 and 0.1 ⁇ y ⁇ 2.0, or (1-2) 0.2 ⁇ x ⁇ 3.0 and 0.1 ⁇ y ⁇ 2. .0 It is brass characterized by the amount satisfying this relationship.
  • Group (I), subgroup (2) Cu: 55 mass% or more and 75 mass% or less, Si: 0.01% by mass or more and 0.1% by mass or less, Sn and Al: amounts satisfying the following relationship, Mn as an optional component: less than 0.25% by mass, Ti as an optional component: less than 0.05% by mass, Mg as an optional component: less than 0.3% by mass, P as an optional component: less than 0.15% by mass, Rare earth metal as an optional component: less than 0.004% by mass, It consists of Zn as the balance and inevitable impurities, (2) The apparent zinc content is 39 or more and less than 43, and Sn (x mass%) and Al (y mass%) are (2-1) 0.1 ⁇ x ⁇ 0.2 and ⁇ 4x + 0.9 ⁇ y ⁇ 2.0, or (2-2) 0.2 ⁇ x ⁇ 3.0 and 0.1 ⁇ y ⁇ 2.0 It is brass characterized by the amount satisfying this relationship.
  • group (I), subgroup (3) Cu: 55 mass% or more and 75 mass% or less, Si: 0.01% by mass or more and 0.1% by mass or less, Sn and Al: amounts satisfying the following relationship, Mn as an optional component: less than 0.25% by mass, Ti as an optional component: less than 0.05% by mass, Mg as an optional component: less than 0.3% by mass, P as an optional component: less than 0.15% by mass, Rare earth metal as an optional component: less than 0.004% by mass, It consists of Zn as the balance and inevitable impurities, (3) The apparent zinc content is 43 or more and 45 or less, and Sn (x mass%) and Al (y mass%) are (3-1) 0.1 ⁇ x ⁇ 0.2 and 0.5 ⁇ y ⁇ 2.0, (3-2) 0.2 ⁇ x ⁇ 0.3 and ⁇ 4x + 1.3 ⁇ y ⁇ 2.0, or (3-3) 0.3 ⁇ x ⁇ 3.0 and 0.1 ⁇ y ⁇ 2.0 It is brass characterized by the amount satisfying this relationship.
  • Group (II), subgroup (1) Cu: 55 mass% or more and 75 mass% or less, Si: more than 0.1% by mass, 0.5% by mass or less, Sn and Al: amounts satisfying the following relationship, Mn as an optional component: less than 0.25% by mass, Ti as an optional component: less than 0.05% by mass, Mg as an optional component: less than 0.3% by mass, P as an optional component: less than 0.15% by mass, Rare earth metal as an optional component: less than 0.004% by mass, It consists of Zn as the balance and inevitable impurities, (4) The apparent zinc content is 37 or more and less than 39, and Sn (x mass%) and Al (y mass%) are (4-1) 0.1 ⁇ x ⁇ 0.2 and ⁇ 5x + 1.5 ⁇ y ⁇ 2.0, or (4-2) 0.2 ⁇ x ⁇ 3.0, and 0.1 ⁇ y ⁇ 2.0 It is brass characterized by the amount satisfying this relationship.
  • group (II), subgroup (2) Cu: 55 mass% or more and 75 mass% or less, Si: more than 0.1% by mass, 0.5% by mass or less, Sn and Al: amounts satisfying the following relationship, Mn as an optional component: less than 0.25% by mass, Ti as an optional component: less than 0.05% by mass, Mg as an optional component: less than 0.3% by mass, P as an optional component: less than 0.15% by mass, Rare earth metal as an optional component: less than 0.004% by mass, It consists of Zn as the balance and inevitable impurities, (5) The apparent zinc content is 39 or more and less than 41, and Sn (x mass%) and Al (y mass%) are (5-1) 0.1 ⁇ x ⁇ 0.2 and ⁇ 5x + 1.5 ⁇ y ⁇ 2.0, or (5-2) 0.2 ⁇ x ⁇ 3.0 and 0.1 ⁇ y ⁇ 2.0 It is brass characterized by the amount satisfying this relationship.
  • Group (II), subgroup (3) Cu: 55 mass% or more and 75 mass% or less, Si: more than 0.1% by mass, 0.5% by mass or less, Sn and Al: amounts satisfying the following relationship, Mn as an optional component: less than 0.25% by mass, Ti as an optional component: less than 0.05% by mass, Mg as an optional component: less than 0.3% by mass, P as an optional component: less than 0.15% by mass, Rare earth metal as an optional component: less than 0.004% by mass, It consists of Zn as the balance and inevitable impurities, (6)
  • Group (II), subgroup (4) Cu: 55 mass% or more and 75 mass% or less, Si: more than 0.1% by mass, 0.5% by mass or less, Sn and Al: amounts satisfying the following relationship, Mn as an optional component: less than 0.25% by mass, Ti as an optional component: less than 0.05% by mass, Mg as an optional component: less than 0.3% by mass, P as an optional component: less than 0.15% by mass, Rare earth metal as an optional component: less than 0.004% by mass, It consists of Zn as the balance and inevitable impurities, (7) The apparent zinc content is 43 or more and 45 or less, and Sn (x mass%) and Al (y mass%) are (7-1) 0.3 ⁇ x ⁇ 0.4 and ⁇ 5x + 2.5 ⁇ y ⁇ 2.0, (7-2) 0.4 ⁇ x ⁇ 0.5 and ⁇ 4x + 2.1 ⁇ y ⁇ 2.0, or (7-3) 0.5 ⁇ x ⁇ 3.0 and 0.1 ⁇ y ⁇ 2.0 It is brass characterized by the amount
  • group (III), subgroup (1) Cu: 55 mass% or more and 75 mass% or less, Si: more than 0.5% by mass, 1.0% by mass or less, Sn and Al: amounts satisfying the following relationship, Mn as an optional component: less than 0.25% by mass, Ti as an optional component: less than 0.05% by mass, Mg as an optional component: less than 0.3% by mass, P as an optional component: less than 0.15% by mass, Rare earth metal as an optional component: less than 0.004% by mass, It consists of Zn as the balance and inevitable impurities, (8) The apparent zinc content is 37 or more and less than 39, and Sn (x mass%) and Al (y mass%) are (8-1) 0.1 ⁇ x ⁇ 0.2 and ⁇ 4x + 0.9 ⁇ y ⁇ 2.0, or (8-2) 0.2 ⁇ x ⁇ 3.0 and 0.1 ⁇ y ⁇ 2.0 It is brass characterized by the amount satisfying this relationship.
  • group (III), subgroup (2) Cu: 55 mass% or more and 75 mass% or less, Si: more than 0.5% by mass, 1.0% by mass or less, Sn and Al: amounts satisfying the following relationship, Mn as an optional component: less than 0.25% by mass, Ti as an optional component: less than 0.05% by mass, Mg as an optional component: less than 0.3% by mass, P as an optional component: less than 0.15% by mass, Rare earth metal as an optional component: less than 0.004% by mass, It consists of Zn as the balance and inevitable impurities, (9) The apparent zinc content is 39 or more and less than 41, and Sn (x mass%) and Al (y mass%) are (9-1) 0.1 ⁇ x ⁇ 0.2 and ⁇ 5x + 2.0 ⁇ y ⁇ 2.0, (9-2) 0.2 ⁇ x ⁇ 0.3 and ⁇ 4x + 1.3 ⁇ y ⁇ 2.0, (9-3) 0.3 ⁇ x ⁇ 0.4 and 0.1 ⁇ y ⁇ 2.0, or (9-4) 0.4 ⁇ x ⁇
  • group (III), subgroup (4) Cu: 55 mass% or more and 75 mass% or less, Si: more than 0.5% by mass, 1.0% by mass or less, Sn and Al: amounts satisfying the following relationship, Mn as an optional component: less than 0.25% by mass, Ti as an optional component: less than 0.05% by mass, Mg as an optional component: less than 0.3% by mass, P as an optional component: less than 0.15% by mass, Rare earth metal as an optional component: less than 0.004% by mass, It consists of Zn as the balance and inevitable impurities, (11) The apparent zinc content is 43 or more and 45 or less, and Sn (x mass%) and Al (y mass%) are (11-1) 0.3 ⁇ x ⁇ 0.4 and ⁇ 5x + 3.0 ⁇ y ⁇ 2.0, or (11-2) 0.4 ⁇ x ⁇ 3.0 and 0.1 ⁇ y ⁇ 2.0 It is brass characterized by the amount satisfying this relationship.
  • Twelfth aspect group (IV), subgroup (1) Cu: 55 mass% or more and 75 mass% or less, Si: more than 1.0 mass%, 1.5 mass% or less, Sn and Al: amounts satisfying the following relationship, Mn as an optional component: less than 0.25% by mass, Ti as an optional component: less than 0.05% by mass, Mg as an optional component: less than 0.3% by mass, P as an optional component: less than 0.15% by mass, Rare earth metal as an optional component: less than 0.004% by mass, It consists of Zn as the balance and inevitable impurities, (12) The apparent zinc content is 37 or more and less than 39, and Sn (x mass%) and Al (y mass%) are (12-1) 0.1 ⁇ x ⁇ 0.2 and ⁇ 4x + 0.9 ⁇ y ⁇ 2.0, (12-2) 0.2 ⁇ x ⁇ 0.3 and 0.1 ⁇ y ⁇ 2.0, or (12-3) 0.3 ⁇ x ⁇ 3.0 and 0.1 ⁇ y ⁇ 2. .0 It is brass characterized by the amount
  • Group (IV), subgroup (2) Cu: 55 mass% or more and 75 mass% or less, Si: more than 1.0 mass%, 1.5 mass% or less, Sn and Al: amounts satisfying the following relationship, Mn as an optional component: less than 0.25% by mass, Ti as an optional component: less than 0.05% by mass, Mg as an optional component: less than 0.3% by mass, P as an optional component: less than 0.15% by mass, Rare earth metal as an optional component: less than 0.004% by mass, It consists of Zn as the balance and inevitable impurities, (13) The apparent zinc content is 39 or more and less than 41, and Sn (x mass%) and Al (y mass%) are (13-1) 0.1 ⁇ x ⁇ 0.2 and ⁇ 5x + 2.0 ⁇ y ⁇ 2.0, (13-2) 0.2 ⁇ x ⁇ 0.3 and 1.0 ⁇ y ⁇ 2.0, or (13-3) 0.3 ⁇ x ⁇ 3.0 and 0.1 ⁇ y ⁇ 2. .0 It is brass characterized by the amount satisfying this
  • group (IV), subgroup (3) Cu: 55 mass% or more and 75 mass% or less, Si: more than 1.0 mass%, 1.5 mass% or less, Sn and Al: amounts satisfying the following relationship, Mn as an optional component: less than 0.25% by mass, Ti as an optional component: less than 0.05% by mass, Mg as an optional component: less than 0.3% by mass, P as an optional component: less than 0.15% by mass, Rare earth metal as an optional component: less than 0.004% by mass, It consists of Zn as the balance and inevitable impurities, (14) When the apparent zinc content is 41 or more and less than 43, Sn (x mass%) and Al (y mass%) are (14-1) 0.4 ⁇ x ⁇ 0.5 and ⁇ 5x + 3.0 ⁇ y ⁇ 2.0, or (14-2) 0.5 ⁇ x ⁇ 3.0 and 0.1 ⁇ y ⁇ 2.0 It is brass characterized by the amount satisfying this relationship.
  • group (IV), subgroup (4) Cu: 55 mass% or more and 75 mass% or less, Si: more than 1.0 mass%, 1.5 mass% or less, Sn and Al: amounts satisfying the following relationship, Mn as an optional component: less than 0.25% by mass, Ti as an optional component: less than 0.05% by mass, Mg as an optional component: less than 0.3% by mass, P as an optional component: less than 0.15% by mass, Rare earth metal as an optional component: less than 0.004% by mass, It consists of Zn as the balance and inevitable impurities, (15) The apparent zinc content is 43 or more and 45 or less, and Sn (x mass%) and Al (y mass%) are (15-1) 0.2 ⁇ x ⁇ 0.3 and ⁇ 5x + 2.5 ⁇ y ⁇ 2.0, (15-2) 0.3 ⁇ x ⁇ 0.4 and ⁇ 4x + 1.7 ⁇ y ⁇ 2.0, or (15-3) 0.4 ⁇ x ⁇ 3.0 and 0.1 ⁇ y ⁇ 2.0 An amount satisfying the above relationship, brass
  • Cu is contained in the range of 55% by mass or more and 75% by mass or less.
  • the preferable lower limit is 60% by mass or more
  • the preferable upper limit is 70% by mass or less.
  • the brass according to the present invention comprises Si in a range of 0.01 wt% to 1.5 wt%.
  • the effect that favorable castability is securable by adding Si is acquired.
  • the addition of Sn broadens the solidification temperature range and easily causes casting cracks and sink marks. Therefore, it has often been considered that adding a large amount of Sn to a brass material for casting should be avoided.
  • Si addition suppressed their generation. As a result, a highly corrosion-resistant brass material that does not undergo heat treatment that can be cast was realized.
  • the brass according to the present invention contains Mn as an optional component, its abundance is less than 0.25% by mass, preferably less than 0.2% by mass, more preferably less than 0.1% by mass. It is said. Although the effect of improving the strength can be obtained by adding Mn, since Si and an intermetallic compound are formed, Si may be consumed and castability may be lowered, and the addition is preferably within the above range.
  • the brass according to the present invention contains Ti as an optional component, its abundance is less than 0.05% by mass, preferably less than 0.01% by mass, and more preferably not contained. .
  • the effect of crystal grain refinement can be obtained by adding Ti, it is preferable that Ti is not added because Ti is easily oxidized and even when added in a small amount, the fluidity during casting is significantly reduced.
  • the brass according to the present invention contains Mg as an optional component, its abundance is less than 0.3% by mass, preferably less than 0.05% by mass, and more preferably not contained.
  • the effect of crystal grain refinement can be obtained by adding Mg, but since Si and an intermetallic compound are formed, Si may be consumed and castability may be reduced, and the addition is preferably within the above range. .
  • the brass according to the present invention contains P as an optional component, its abundance is less than 0.15% by mass, preferably less than 0.1% by mass.
  • the brass according to the present invention contains a rare earth metal as an optional component, its abundance is less than 0.004% by mass, preferably less than 0.001% by mass, and more preferably not contained.
  • the rare earth metal is a group of elements composed of La and Ce, and the effect of refining crystal grains can be obtained by adding these elements.
  • rare earth metals are easily oxidized, and the fluidity during casting can be obtained even in a small amount. Is significantly reduced. Thereby, since melt replenishment property deteriorates and there is a concern that casting cracks are likely to occur in the final solidified portion, it is preferable not to be added.
  • either one of Pb and Bi is further contained in the range of 0.01 wt% to 4.0 wt%. Addition of these improves chip cutting property and provides good machinability. By adding these, cutting resistance is reduced, and further good machinability is obtained.
  • Pb is a substance that is feared to be harmful to the human body and the environment. Although Bi has not yet been clarified in its harmfulness, Bi cannot be said to be harmless. Therefore, it is not preferable to add these elements more than necessary.
  • the preferable lower limit value of the addition amount of Pb and Bi is both 0.3% by mass or more, and the more preferable lower limit value is 1.0% by mass or more. Moreover, a preferable upper limit is 3.5 mass% or less, and a more preferable upper limit is 3.0 mass% or less.
  • the preferable lower limit of the addition amount of Pb and Bi is both 0.05% by mass or more, the more preferable lower limit is 0.1% or more, and the preferable upper limit is It is 0.3 mass% or less, and a more preferable upper limit is 0.25 mass% or less.
  • the abundance of either one is less than 0.5% by mass, preferably less than 0.1% by mass, more preferably It is not included.
  • the addition amount is preferably set to the above.
  • B is further contained in the range of 0.0001 wt% to 0.3 wt%.
  • B By adding B, it is possible to obtain a good effect of suppressing casting cracking. On the other hand, excessive addition of B may cause deterioration of the extensibility of the alloy. In addition, the alloy becomes hard and the cutting resistance increases during cutting, which may increase the cutting cost.
  • the preferable lower limit of the addition amount of B is 0.0003% by mass or more, the more preferable lower limit is 0.0007% by mass or more, and the preferable upper limit is 0.03% by mass or less, and the more preferable upper limit is Is 0.01 mass% or less.
  • the brass according to the present invention contains Ni as an optional component, its abundance is 0.7% by mass or less, preferably 0.2% by mass or less, and more preferably not contained. .
  • the mechanical properties are improved by the addition of Ni, casting cracks are likely to occur. Although this casting crack can be suppressed to some extent by adding B, there is a concern that it will be difficult to suppress even if B is present due to an increase in the amount of Ni present. Therefore, according to a preferred embodiment of the present invention, the amount of Ni added is preferably 0.7% by mass or less when B is included, and 0.2% by mass or less when B is not included. It is preferable.
  • the brass according to the present invention includes other components such as Sb that contributes to the improvement of corrosion resistance when added in a small amount, and Fe that can improve casting cracking properties and can be expected to improve strength as a micronizing agent. It may be selected as an additive element and added.
  • These components may affect the corrosion resistance and castability depending on the amount of addition, but the influence can be suppressed by adjusting Al, Sn, Si, and apparent zinc content. That is, in the above range, the amount of Al can be further increased, conversely, the amount of Sn can be further increased, or both can be increased, and the influence can be suppressed by increasing or decreasing the Si or apparent zinc content. I can do it.
  • the brass according to the present invention contains one or more elements selected from the group consisting of Sb, As, Se, Te, Fe, Co, Zr, and Cr, preferably 0.01 to 2 mass% can be contained.
  • one or more elements selected from the group consisting of Sb and As can be contained, and the preferred content is 0.2% by mass or less. It is.
  • Se or Te is preferably contained in an amount of 1% by mass or less in order to improve machinability.
  • one or more elements selected from the group consisting of Fe, Co, Zr, and Cr can be contained, and the preferred content is Fe.
  • Co are preferably 1% by mass or less, and Zr and Cr are preferably 0.5% by mass or less.
  • the brass according to the present invention can be provided and used without a heat treatment step that greatly affects the cost and productivity of dezincing resistant brass.
  • the machinability, castability, and mechanical properties are equal to or higher than those of brass containing Pb, it can be used in the same manner as other brasses in applications where brass is used.
  • the brass according to the present invention is preferably used for a faucet fitting material. Specifically, it is preferably used as a material for water supply fittings, drainage fittings, valves and the like.
  • the molded product made of brass according to the present invention can be manufactured by either die casting or sand casting because of its good castability. You can enjoy it. Moreover, since the brass according to the present invention is also good in its machinability, it may be cut after casting. Further, the brass according to the present invention may be a cutting bar or a forging bar that is formed by extrusion after continuous casting, or a wire that is formed by drawing.
  • Cast crackability test Cast crackability was evaluated by a both-end constrained test method.
  • the shape of the mold 1 used was as shown in FIG. In FIG. 1, the heat insulating material 2 is provided in the central portion, the cooling of the central portion is delayed from the both-end constraining portion 3, the constraining end distance (2L) is 100 mm, and the heat insulating material length (2l) is 70 mm. .
  • Corrosion resistance test An ingot having a diameter of 35 mm and a length of 100 mm produced by die casting was obtained, and this was used as a test piece, and a test was conducted in accordance with the Japan Copper and Brass Association Technical Standard JBMA T-303-2007. The result was determined as ⁇ when the maximum erosion depth was 150 ⁇ m or less and ⁇ when the maximum erosion depth exceeded 150 ⁇ m.
  • Examples 1 to 634 Brass having the composition described in the following table was cast. That is, electrical Cu, electrical Zn, electrical Bi, electrical Pb, electrical Sn, electrical Al, Cu-30% Ni master alloy, Cu-15% Si master alloy, Cu-2% B master alloy, Cu-30% Mn master Alloy, Cu-10% Cr master alloy, Cu-15% P master alloy, Cu-10% Fe master alloy, Cu-30% Mg master alloy, etc. as raw materials are melted while adjusting the components in an electric melting furnace. Cast cracking was evaluated by casting in a restraint test mold. Further, an ingot having a diameter of 35 mm and a length of 100 mm was produced by casting into a cylindrical mold, and corrosion resistance and machinability tests were performed using the ingot as a test material. The evaluation results were as shown in the following table.

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Abstract

La présente invention a trait à un laiton qui présente une résistance élevée à la corrosion, même sans subir d'étape de traitement thermique destinée à inhiber la corrosion par dézincification. Le laiton selon l'invention comprend de 55 à 75 % en masse de Cu et de 0,01 à 1,5 % en masse de Si, contient du Sn et de l'Al suivant des quantités telles qu'elles satisfont à des relations prédéfinies comprenant la teneur apparente en zinc, et contient en outre, comme composants facultatifs, moins de 0,25 % en masse de Mn, moins de 0,05 % en masse de Ti, moins de 0,3 % en masse de Mg, moins de 0,15 % en masse de P, et moins de 0,004 % en masse d'un métal du groupe des terres rares, le reste consistant en du Zn et des impuretés inévitables. Le laiton selon l'invention présente une teneur apparente en zinc située dans la plage allant de 37 à 45.
PCT/JP2013/052354 2012-02-01 2013-02-01 Laiton présentant une excellente résistance à la corrosion WO2013115363A1 (fr)

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CN201380004072.7A CN103958708B (zh) 2012-02-01 2013-02-01 耐腐蚀性优异的黄铜
US14/346,620 US10351933B2 (en) 2012-02-01 2013-02-01 Brass with excellent corrosion resistance

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CN103911525A (zh) * 2014-03-25 2014-07-09 安新县华昌合金厂 一种废料再生无铅黄铜合金及其制备方法
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US11028466B2 (en) 2016-01-21 2021-06-08 Fortune Mfg. Co., Ltd. Unleaded free-cutting brass alloys with excellent castability, method for producing the same, and application thereof
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CN103602853A (zh) * 2013-11-12 2014-02-26 福建省南安市鹏鑫铜业有限公司 一种低铅挤制黄铜棒及其生产方法
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US10351933B2 (en) 2019-07-16
EP2743360B1 (fr) 2018-04-04
JP6493473B2 (ja) 2019-04-03
EP2743360B2 (fr) 2021-06-23
CN103958708A (zh) 2014-07-30
CN103958708B (zh) 2016-11-16
EP2743360A4 (fr) 2015-06-24
US20140234156A1 (en) 2014-08-21
JP2018048398A (ja) 2018-03-29
JPWO2013115363A1 (ja) 2015-05-11
EP2743360A1 (fr) 2014-06-18

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